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Xilinx 8.2i manual Simulation, Back-Annotation

Models: 8.2i

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Chapter 2: Design Flow

R

The following figure shows the verification methods of the design flow for CPLDs.

Simulation

Input Stimulus

Simulation

Simulation Netlist

Translate to

Simulator Format

Basic Design Flow

Integrated Tool

Design Entry

Functional Simulator

Paths

 

Translate to

 

 

NGD

 

Simulator Format

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Optimization and

Fitting

Static Timing

Timing Simulation Path

Translation

VM6

 

Programming

File Creation

Back-Annotation

JED

NGA

Xilinx CPLD

Static Timing Analysis

In-Circuit Verification

In-Circuit Verification

X9538

Figure 2-8:Three Verification Methods of the Design Flow (CPLDs)

Simulation

You can run functional or timing simulation to verify your design. This section describes the back-annotation process that must occur prior to timing simulation. It also describes the functional and timing simulation methods for both schematic and HDL-based designs.

Back-Annotation

Before timing simulation can occur, the physical design information must be translated and distributed back to the logical design. For FPGAs, this back-annotation process is done with a program called NetGen. For CPLDs, back-annotation is performed with the TSim Timing Simulator. These programs create a database, which translates the back-annotated information into a netlist format that can be used for timing simulation.

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Xilinx 8.2i manual Simulation, Back-Annotation
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8.2i specifications

Xilinx 8.2i is a significant version of the Xilinx ISE (Integrated Software Environment) that emerged in the early 2000s, marking an important milestone in the world of FPGA (Field-Programmable Gate Array) development. This version introduced a slew of advanced features, technologies, and characteristics that made it an indispensable tool for engineers and developers in designing, simulating, and implementing digital circuits.

One of the standout features of Xilinx 8.2i is its enhanced design entry capabilities. This version supports multiple design entry methods, including schematic entry, VHDL, and Verilog HDL, giving engineers the flexibility to choose their preferred approach. The integrated environment provides user-friendly graphical interfaces, making it accessible for both novice and experienced users.

Xilinx 8.2i's synthesis tools have been improved to enable more efficient design compilation and optimization. The new algorithms used in this version facilitate faster synthesis times while reducing power consumption and improving performance. Furthermore, it features support for advanced FPGA architectures, which allows for the implementation of more complex designs with greater efficiency.

The implementation tools in Xilinx 8.2i include advanced place and route capabilities, utilizing state-of-the-art algorithms for optimized resource usage. These tools enable designers to make better use of FPGA resources, ensuring that designs fit within the constraints of the target device while maximizing performance.

Another key characteristic of Xilinx 8.2i is its extensive support for various Xilinx devices such as the Spartan, Virtex, and CoolRunner series. This compatibility ensures that developers can leverage the powerful features of these FPGA families, including high-speed transceivers and DSP slices.

Xilinx 8.2i also places a strong emphasis on simulation and verification. The version integrates with various simulation tools, allowing for thorough testing of the designs before implementation. This reduces the risk of errors and ensures that the final product meets specifications.

In addition, this version includes support for design constraints, enabling engineers to specify timing, area, and other critical design parameters. By accommodating constraints, Xilinx 8.2i helps in achieving reliable and efficient designs tailored to project needs.

In summary, Xilinx 8.2i is a robust software development tool that enhances the design process for FPGAs. Its comprehensive features, including multiple design entry options, advanced synthesis and implementation tools, extensive device support, and strong simulation capabilities, make it a valuable resource for engineers and developers striving for innovation in digital design.